Jeong, Min-Gi Lee, Hyun Ho Shin, Hyeon-Ji Jeong, Yeseul Hwang, Jang-Yeon Kwak, Won-Jin Oh, Gwangseok Kim, Wonkeun Ryu, Kyounghan Yu, Seungho Lim, Hee-Dae Lee, Minah Jung, Hun-Gi 2024-01-19T09:04:31Z 2024-01-19T09:04:31Z 2023-07-20 2023-07 2050-7488 https://pubs.kist.re.kr/handle/201004/113526 Li-O-2 batteries attract extensive attention because they exhibit the highest theoretical energy density among the rechargeable batteries reported so far. However, most studies have focused on improving the cyclability and efficiency of Li-O-2 batteries under low-capacity conditions instead of under practical conditions. Here, we increase the capacity range of Li-O-2 batteries to a practical condition of 5 mA h cm(-2) by introducing CF3(CF2)(2)I as a dual-functional additive. An electrolyte comprising 1 M LiNO3 in N,N-dimethylacetamide and CF3(CF2)(2)I provides stable cycle retention and high reversibility even at high areal capacity. Ab initio molecular dynamics simulations demonstrate that the reaction between CF3(CF2)(2)I and Li metal is spontaneous and leads to the simultaneous formation of LiF as a protective layer on Li metal and LiI as a redox mediator for the oxygen evolution reaction. This study provides new insights for the development of electrolyte additives toward practical Li-O-2 batteries. English Royal Society of Chemistry A fluoroalkyl iodide additive for Li-O2 battery electrolytes enables stable cycle life and high reversibility Article 10.1039/d3ta01686b 1 Journal of Materials Chemistry A, v.11, no.28, pp.15246 - 15255 Journal of Materials Chemistry A 11 28 15246 15255 N scie scopus 001020545200001 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article